Air conditioner mounting means

ABSTRACT

This invention produces readily adjustable and installable closure means for providing a fluid seal between a hollow casing of an air-conditioner unit, having top and bottom walls interconnected by a pair of spaced apart left and right side walls, and the left and right side and top walls of a generally vertically arranged opening, such as a window or the like, in which the casing is mounted with its bottom wall adjacent the bottom wall of the opening. Basically, the closure means comprises a telescopic pair of inverted generally U-shaped closure members. The first or bottom one of these two closure members includes a first pair of legs, whose left and right inner surfaces are respectively engageable with the casing left and right side walls and whose left and right outer surfaces are respectively engageable with the opening side walls, and a first bight portion, whose bottom is engageable with the casing top wall. The second or upper closure member includes a second pair of legs, which are mounted in track means provided on the first pair of legs for slideable movement relative thereto and whose left and right outer surfaces are respectively engageable with the opening side walls, and a second bight portion, whose bottom is engageable with the top of the first bight portion and whose top is engageable with the opening top wall.

United States Pat ent Loyd [451' Aug. 1, 1972 [54] AIR CONDITIONERMOUNTING [57] ABSTRACT MEANS This invention produces readily adjustableand instal- [72] Inventor: Raymond E. Loyd, .leffersontown, lableclosure means for providing a fluid seal between Ky. a hollow casing ofan air-conditioner unit, having top 73 A 2 Ge IE] t C and bottom wallsinterconnected by a pair of spaced 1 Sslgnee cc ompany apart left andright side walls, and the left and right Filed! 18, 1970 side and topwalls of a generally vertically arranged [21] APPL No; 99,594 opening,such as a window or the like, in which the casing is mounted with itsbottom wall ad acent the bottom wall of the opening. Basically, theclosure (SI. ..49/168, 98lzs4d66b2/72lgg means comprises a telescopicpair of inverted a 0 e s s t i u: e s t u [58] held of Search 98/94160/228 tom one of these two closure members includes a first [56]References Cited UNITED STATES PATENTS 3,030,873 4/ 1962 Metcalfe..98/94 AC 2,946,274 7/1960 Grimes, Jr ..62/262 X 3,378,957 4/1968Freshe ..49/487 3,415,074 12/ l 968 Metcalfe ..62/262 PrimaryExaminerl(enneth Downey Att0rneyFrancis H. Boos, Jr., Frank L. Neuhauserand Walter E. Rule pair of legs, whose left and right inner surfaces arerespectively engageable with the casing left and right side walls andwhose left and right outer surfaces are respectively engageable with theopening side walls, and a first bight portion, whose bottom isengageable with the casing top wall. The second or upper closure memberincludes a second pair of legs, which are mounted in track meansprovided on the first pair of legs for slideable movement relativethereto and whose left and right outer surfaces are respectivelyengageable with the opening side walls, and a second bight portion,whose bottom is engageable with the top of the first bight portion andwhose top is engageable with the opening top wall.

3 Claims, 8 Drawing Figures PATENTEDws 1 m2 SHhEI 2 BF 2 YINVENTORRAVMOMD E Low) W121: I H \5 ATTORNEY BACKGROUND OF THE INVENTION Thisinvention relates to air-conditioner units and, more particularly, toimproved means for mounting an air-conditioner unit in a wall opening,such as a window or the like.

Still more specifically, the present invention is directed towardreadily adjustable and installable closure means for providing a fluidseal between a hollow casing of an air-conditioner unit, having top andbottom walls interconnected by a pair of spaced apart left and rightside walls, and the left and right side and top walls of a generallyvertically arranged opening, such as a window or the like, in which thecasing is mounted with its bottom wall adjacent the opening bottom wall.

While not limited in use thereto, the novel means provided by thisinvention are particularly adapted to provide a fluid seal between anair-conditioning unit casing and a so-called slider-type window openingwherein the window sash has its top and bottom edges mounted forslidable movement in a pair of generally horizontal channels.

U.S. Pat. No. 3,415,074 illustrates a typical form of the conventionalmeans which have heretofore been utilized for mounting anair-conditioner unit casing in such a slider-type window. With suchprior-art arrangements, the left and right side walls of the casing arerespectively trapped between the right edge of the slidable window sashand the left edge of the fixed right wall of the window opening, whilethe considerable remaining open space between the casing top wall andthe lower edge of the fixed top wall of the window opening is closed bya sealing panel that is typically made of composition board, such asMasonite or the like. And, because the height dimension of the openingto be sealed between the casing top wall and the window opening top wallmay vary widely, such conventional sealing panels must be individuallymanually cut to size by field installation personnel or by the consumer.

SUMMARY OF THE INVENTION The present invention provides readilyadjustable and installable closure means for providing a fluid sealbetween a hollow'casing of an air-conditioner unit, having top andbottom walls interconnected by a pair of spaced apart left and rightside walls, and the left and right side and top walls of a generallyvertically arranged opening in which the casing is mounted with itsbottom wall adjacent the opening bottom wall. Basically, the novelclosure means of the present invention comprises a pair of invertedgenerally U-shaped closure members. The first of these two closuremembers .includes a first pair of legs, whose left and right innersurfaces are respectively engageable with the casing left and right sidewalls and whose left and right outer surfaces are respectivelyengageable with the opening side walls, and a first bight portion, whosebottom is engageable with the casing top wall. The second of these twoclosure members includes a second pair of legs, which are mounted intrack means provided on the first pair of legs for slidable movementrelative thereto and whose left and right outer surfaces arerespectively engageable with the opening side walls, and a second bightportion, whose bottom is engageable with the top of the first bightportion and whose top is engageable with the opening top wall.

The novel closure means of the present invention can be shipped to theinstallation site detached from, but co-packaged with, theair-conditioner unit casing, whereupon they can then be readilyinstalled by the consumer and adjusted to the height of the remainingopen space between the casing top wall and the lower v edge of the fixedtop wall of the opening. Preferably this is done by, first respectivelyfastening the left and right inner surfaces of the legs and the bottomof the bight portion of the first of the two closure members to thecasing left and right side and top walls with fastener means, such assheetmetal screws or the like. Next, the casing is mounted in theopening with its bottom wall adjacent the opening bottom wall. Then, theinstaller adjusts the height of the closure means to that of theremaining open space between the casing top wall and the opening topwall by simply pulling upward on the slidably mounted second closuremember and fastening the top of the bight portion thereof to the openingtop wall with fastener means, such as sheetmetal screws or the like.Finally, the closure means side walls are then trapped between theopening side walls. Typically, the

only tool needed for this job is a screwdriver.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is illustratedin the accompanying drawings, wherein:

FIG. 1 is a fragmentary front elevational viewof an air-conditioner unitemploying mounting means incorporating the novel closure means providedby the present invention;

FIG. 2 is an enlarged fragmentary sectional. vie taken along line 2-2 ofFIG. 1;

FIG. 3 is anenlarged fragmentary sectional view taken along line 33 ofFIG. 1;

FIG. 4 is an enlarged fragmentary sectional view taken along line 4-4 ofFIG. 1;

FIG. 5 is an enlarged fragmentary sectional view taken along line 55 ofFIG. 1;

FIG. 6 is an enlarged fragmentary, partly broken, sectional viewtakenalong line 6-'6 of FIG. 1;

FIG. 7 is a partly broken, sectional view taken along line 7-7 of FIG.6; and I FIG. 8 is a greatly enlarged fragmentary elevationalperspective view showing details of the construction of and slidableinterconnection of the right legs of the two closure members whichcomprise the closure means of the present invention and the gasket meansthat are preferably integrally formed therewith.

DESCRIPTION OF THE PREFERRED EMBODIMENT evaporator (not shown) that areinterconnected in a well-known manner by means (not shown) to form arefrigeration system. The unit 10 is disposed within the wall openingsuch that the condenser is in communication with ambient air and theevaporator is in communication with the room or other space to be cooledor otherwise conditioned. Suitable fan means (not shown) are alsoprovided in a well-known manner within the air-conditioner unit casing13 to pass air over the evaporator and condenser respectively.

As best shown in FIGS. 1-2 and 5-7, the unit casing 13 has a pair ofgenerally vertically arranged, spaced apart, left 13L and right 13R sidewalls, which are interconnected by a top wall 13U and a bottom wall 13D,and a front or room side wall that has an opening (not shown) that isprovided with a cover or grille 14, which can be removed therefrom topermit access to the interior of the casing 13. The air-conditioner unitis mounted within an opening that is defined by the fixed top 12U andbottom 12D and left 12L side walls of the slider-type window 12 and theleft edge of the slidertype windows slideable sash 12?, which has itstop and bottom edges respectively mounted for slideable (leftright;right-left) movement in a pair of generally horizontal upper U (FIG. 2)and lower 15D (FIG. 7) channels that are respectively mounted on thefixed top 12U and bottom 12D walls of the window 12, with the casingbottom wall 13D being mounted adjacent to the fixed bottom wall 12D ofthe opening (FIGS. 1 and 7).

Typically, the height dimension of the slider-type windows, such as thewindow 12, ranges between 24 and 40 inches, while a typical heightdimension of the air-conditioner unit casing 13 is 10 /2 inches.Therefore, once the air-conditioner unit casing 13 is mounted in thewall opening that is provided by sliding the window sash 12P rightwardas shown in FIG. I, it is then necessary to provide closure means forproviding a fluid seal for the open space which remains between thecasing top wall 13U of the lower edge of the fixed top wall 12U of theopening. As noted above, the height dimension of this remaining openspace may vary widely; typically ranging anywhere from 13 /2 to 29%inches. Heretofore, as noted previously, it has been conventional toemploy a panel made of composition board, such as Masonite or the like,for such closure means. And, because of the aforenoted wide variation ofthe height dimension of the remaining open space between the casing topwall 13U and the opening fixed top wall 12U, it has, in the past, beennecessary for such priorart sealing panels to be individually manuallycut to the necessary dimension by field personnel or by the consumer atthe installation site for the air-conditioner 10.

The present invention is particularly concerned with providing novelclosure means, such as the closure means 11, for sealing such aremaining space between the casing top wall 13U and the opening fixedtop wall 12U, which can be shipped to an installation site for theair-conditioner 10 from, but co-packaged with, the airconditioner unitcasing 13, whereupon they can then be readily installed by the consumerand adjusted to the height dimension of the remaining open space betweenthe casing top wall 13U and the opening fixed top wall 12U.

The presently preferred form 11 of the novel closure means that areprovided in accordance with the present invention comprises a telescopicpair of inverted generally U-shaped closure members, including a firstor bottom closure member, generally designated 16, and a second or upperclosure member, generally designated 17 (FIG. 1). The first or bottomclosure member 16 includes a first or bottom pair of legs, comprising aleft leg 16LL and a right leg 16LR, and a first or bottom bight portion168, which is laterally interconnected between the first or bottom pairof legs 16LL and 16LR and whose bottom 16BD is engageable with thecasing top wall 13U. The second or upper closure member 17 includes asecond or upper pair of legs, comprising a left leg 17LL and a right legl7LR, the

lower portions of which are mounted in track means 16TL and 16TR (FIGS.5, 6 and 8) provided on the first or bottom pair of legs 16LL and 16LRfor slidable movement (up-down; down-up) relative thereto, and a secondor upper bight portion 178, which is laterally interconnected betweenthe second or upper pair of legs 17LL and l7LR and whose bottom 17BD isengageable with the top 16BU of the first or bottom bight portion 163and whose top 17BU is engageable with the opening fixed top wall 12U.

Preferably, the first or bottom bight portion 16B comprises a singlepanel 18 that is laterally interconnected between the left 16LL andright 16LR legs of the first or bottom pair of legs by fastener means,such as screws 19,.which are pre-installed prior to shipment of theclosure means 11 to the installation site for the air-conditioner unit10. This single panel 18 has a laterally extending, rearwardlyprojecting bottom flange 18FD (FIGS. 6 and 7) that is, in turn, providedwith a plurality of laterally spaced pre-formed apertures, such asaperture 20A, for receiving fastener means, such as sheetmetal screw 20,that are installed in the field to engage the first or bottom bightportion bottom l6BD to the casing to wall 13U, while the top of thissingle panel 18 has a rearwardly extending top flange 18FU (FIG. 4) thatis adapted to engage means,

which will be described in detail hereinafter, that are provided on thesecond or upper bight portion 178. The lower portions of the left 16LLand right 16LR legs of the first or bottom pair of legs are alsorespectively provided with a plurality of vertically spaced preformedapertures, similar to the aperture 20A, for receiving fastener means,similar to the sheetmetal screw 20, that are installed in the field torespectively engage them to the left 13L and right 13R side walls of theair-conditioner unit casing 13 (FIG. 6).

The second or upper bight portion'17B preferably comprises a pair of topmembers including a cap portion 21 that extends laterally between theleft 17LL and right 17LR legs of the second or upper pair of legs and isinterconnected thereto by fastener means, such as screws 218, which arepre-installed prior to shipment of the closure means 11 to theinstallation site for the airconditioner unit 10, and has its bottom 21D(FIG. 2) interlocked with the flanged top 22U of another panel 22 whichextends laterally between and has its left and right edges respectivelyinterlocked with the left 17LL and right 17LR legs of the second orupper pair of legs (FIG. 5). Preferably, the second or upper bightportion 173 further comprises at least one other panel 23, forming itsbottom 17BD, that extends laterally between the left 17LL and right 17LRlegs of the second or upper pair of legs and is mounted in second orupper track means 17TL and 17TR provided thereon for slidable movement(up-down; down-up) relative thereto.

And, as best shown in FIGS. 3-5, this slidably mounted panel 23 has itsbottom portion provided with a laterally extending, forwardly projectingflange 23FD (FIG. 4) that is engageable with the rearwardly projectingflange 18FU on the top of the panel 18, while its top portion (FIG. 3)is provided with a laterally extending, rearwardly projecting flange23FU that is engageable with a laterally extending, forwardly projectingflange 22FD that is provided on the bottom portion of the upper panel 22of the second or upper bight portion 17B of the second or upper one 17of the telescopic pair of closure members 16 and 17 which comprise thepresently preferred form of the novel closure means 11 of the presentinvention.

As further illustrated, resilient gasket means 16LLG, 17LLG and 16LRG,17LRG (FIGS. 6 and 8) are preferably included for respectively providinga fluid seal between the outer surfaces of the left legs 16LL and 17LLand right legs 16LR and 17LR of both the first or bottom one 16 and thesecond or upper one 17 of the telescopic pair of closure members 16 and17 and left 12L and right 12P side walls of the opening in which theair-conditioner unit casing 13 is mounted, while other resilient gasketmeans 17BUG (FIG. 2) are included for providing a fluid seal between thetop l7BU of the second or upper bight portion 178 of the second or upperclosure member 17 of the closure means 11 and the opening fixed top wall12U.

Also in accordance with the present invention, still other resilientgasket means 16LLg and 16LRg (FIGS. 5, 6 and 8) are preferably includedfor providing a fluid seal between the inner surfaces of the left 16LLand right 16LR legs of the first or bottom one 16 of the telescopicclosure members 16 and 17 and the left 13L and right 13R side walls ofthe air-conditioner casing unit 13, while still other resilient gasketmeans l6LLg', l7LLg and l6LRg, l7LRg' (FIGS. 5, 6 and 8) are preferablyincluded for respectively providing a fluid seal between the innersurfaces of the left 16LL, 17LL and right 16LR, 17LR legs of the firstor bottom one 16 and second or upper one 17 of the telescopic pair ofclosure members 16 and 17 and the adjacent outer peripheries of thethree panels 18, 22 and 23.

As best shown in FIG. 7, yet other resilient gasket means 16BDG areincluded for providing a fluid seal between the casing top wall 13U andthe bottom 16BD of the first or bottom bight portion 168 of the first orbottom one 16 of the telescopic pair of closure members l6 and 17.

As still further illustrated, the presently preferred form 11 of thenovel closure means of the present invention still further includes evenother resilient gasket means 236 (FIG. 4) for providing a fluid sealbetween the top 16BU of the first or bottom bight portion 16B of thefirst or bottom one 16 of the telescopic pair of closure members 16 and17 and still other resilient gasket means 226 (FIG. 3) for providing afluid seal between the top of the slidably mounted panel 23 and thebottom of the fixed panel 22 which comprise the second or upper bightportion 178 of the second or upper one 17 of the telescopic pair ofclosure members 16 and 17 that comprise the novel closure means 11.

In accordance with a particular aspect with the present invention, thegasket means 16LRG, l6LRg and l6LRg' and the right one 16TR of the firstor bottom track means are integrally formed with the right leg 16LR ofthe first or bottom one 16 of the telescopic pair of closure members 16and 17 which comprise the novel closure means 11, with the resilientgasket means 16LRG, 16LRg and l6LRg and the rigid right bottom track16TR and central parts of the right bottom leg 16LR being simultaneouslyextruded from generally similar compound materials, but with thecompound material which forms the resilient gasket means 16LRG, 16LRgand 16LRg having a cured durometer hardness rating that is softer thanthe cured durometer hardness rating of the compound material forming therigid track 16TR and the central parts of the leg 16LR. The resilientgasket means 16LLG, l6LLg and l6LLg' are similarly integrally formed bysimultaneous extrusion with the rigid left bottom track 16TL and centralparts of the left bottom leg 16LL, as are also, respectively: (A) theresilient gasket means 17LRG and l7LRg' with the rigid right upper track17TR and central parts of the right upper leg 17LR; (B) the resilientgasket means 16LLG and l7LLg' with the rigid left upper track 17TL andcentral parts of the left upper leg 17LL; (C) the resilient gasket means17BUG with the rigid bottom 21D and central parts of the cap portion 21of the bight portion 178 of the second or upper closure member 17; (D)the resilient gasket means 16BDG with the rigid flanges 18FU and 18FDand central parts of the panel 18 forming the bight portion 16B of thefirst or bottom one 16 of the telescopic pair closure members 16 and 17;(E) the resilient gasket means 23G with the rigid flanges 23FU and 23FBand central parts of the panel 23 forming the bottom of the bightportion 17B of the second or upper one 17 of the telescopic pair ofclosure members 16 and 17; and (F) the resilient gasket means 226 withthe rigid top 22U and bottom 22FD flanges and central parts of the panel22 forming the upper part of the bight portion 178 of the second orupper closure member 17.

Typically the compound material that is used for forming the rigid legcentral parts and track means, panels and flanges has a cured durometerhardness rating of about and includes the following parts of thefollowing components:

Resin: 100 parts polyvinylchloride Plasticizer: 20 partsDioctylphthalate Stabilizer: 2-5 parts Cadmium Ricineolete Pigment andColorant: l-S parts Titanium Dioxide Filler: 20 parts Calcium CarbonateModifier: 20 parts Acrylic like Rohm and Haas No.

Whereas, the typical compound material that is used for forming the moreresilient gasket means has a durometer hardness rating of about 65 andincludes the following parts of the following components:

Resin: 100 parts polyvinylchloride Plasticizer: 35-50 partsDioctylphthalate Stabilizer: 2 5 parts Cadmium Ricineolete Pigment andColorant: l-5 parts Titanium Dioxide F iller: 20 parts Calcium CarbonateGood extrusions have been obtained using the aforedescribed compounds ina National Rubber Machine Company extruder Model EH and curing bothmaterials at 300 F.

Preferably, the width dimension of each of the three panels 18, 22 and23 is made such that the inner surfaces of the lower portions of theleft 16LL and right LR legs of the first or bottom one 16 of thetelescopic pair of closure members 16 and 17 can be respectively,readily, tightly engaged with the left 13L and right 13R side walls ofthe air-conditioning unit casing 13, while the height dimension of thelower portions of these legs 16LL and 16LR is made generally similar tothat of the casing (typically /2 inches as previously noted). The heightdimensions of the three panels 18, 22 and 23 and the cap portion 21 aresized such that the closure means 11 can be telescopically retracted andextended between a minimum height of 22 inches (with the upper closuremember 17 fully retracted, as for shipment to the installation site forthe air-conditioning unit 10 and a maximum height of 40 inches (with theupper closure member 17 fully extended as illustrated in FIG. 1).

The presently preferred form 11 of the novel closure means of thepresent invention can be shipped to an installation site for theair-conditioner unit 10 detached from, but co-packaged with, theair-conditioner unit casing 13, and adjusted to the height of theremaining open space between the casing top wall 13U and the lower edgeof the opening fixed top wall 12U. Preferably, this is done by, first,respectively fastening the left and right inner surfaces of the lowerportions of the left 16LL and right l6RL legs and the bottom 16BD of thebight portion 16B of the first or bottom one 16 of the telescopic pairof closure members 16 and 17 to the casing left 13L and right 13R andtop 13U walls with fastener means, such as the sheetmetal screws 20.Next, the casing l3is mounted in the opening with its bottom wall 13Dadjacent the opening bottom wall 12D. Then, the consumer-installeradjusts the height of the closure means 11 to that of the remaining openspace between the casing top wall 13U and the opening top wall 12U bysimply pulling upwardly on the top of the bight portion 178 of theslidably mounted second or upper closure member 17 and fastening the capportion 21 thereof to the opening top wall 12U with fastener means, suchas the screws 20 or the like, which are passed through laterally spacedapertures, such as the aperture 20A, that have been pre-formed therein(FIG. 2). Finally, the left and right outer surfaces of the closuremeans left 16LL, 17LL and right 16LR, l7LR legs are then trapped betweenthe opening side walls 12L and 121. Typically, the only tool needed forthis job is a screwdriver.

It should be apparent to those skilled inthe art that, while there hasbeen described what, at present, is considered to be a presentlypreferred embodiment of this invention in accordance with the PatentStatutes, changes may be made to the disclosed apparatus withoutactually departing from the true spirit and scope of this invention. Forexample, resins other than polyvinylchloride might be used in thecompound materials and elastomeric material might be substituted forresin. It is, therefore, intended that the appended claims shall coversuch modifications and applications that do not depart from the truespirit and scope of the present invention.

t' l d' iy i eaiilily a jus t able and installable closure means forproviding a fluid seal between a hollow casing of an air-conditionerunit, having top and bottom walls interconnected by a pair of spacedapart left and right side walls, and the left and right side and topwalls of a generally vertically arranged opening in which said casing ismounted with its bottom wall adjacent the bottom wall of said opening,said closure means comprising:

a first inverted generally U-shaped closure member including:

a first pair of legs of plastic material having rigid inner portionsrespectively engageable with said casing left and right side walls andintegrally formed flexible outer gasket portions respectively engageablewith said opening side walls, and

a first plastic panel secured to and joining said legs and having aflexible bottom edge engageable with, said casing top wall; and

a second inverted generally U-shaped closure member including:

a second pair of legs of plastic material including rigid portionsmounted in track means provided by the rigid inner portions on saidfirst pair of legs for slidable telescopic movement relative to saidfirst pair of legs and having flexible integrally formed gasket portionsrespectively engageable with said opening side walls; and

a second plastic panel bridging said second pair of legs in overlappingrelationship to said first panel and a flexible upper member connectingsaid legs for engagement with said opening top wall;

said first and second pairs of legs being extruded from generallysimilar compound materials, one of which forms the flexible gasketportions and is softer than the compound material forming the rigidinner portions of said legs.

2. The invention of claim 1, wherein said second closure membercomprises a second panel mounted in second track means provided in therigid portions of said second pair of legs for slidable movementrelative to the first panel of said second closure means, said secondpanel overlapping the panels in both of said closure members.

3. The invention of claim 2, further including gasket means forproviding a fluid seal between the outer peripheries of said panels andsurfaces adjacent thereto.

1. Readily adjustable and installable closure means for providing afluid seal between a hollow casing of an airconditioner unit, having topand bottom walls interconnected by a pair of spaced apart left and rightside walls, and the left and right side and top walls of a generallyvertically arranged opening in which said casing is mounted with itsbottom wall adjacent the bottom wall of said opening, said closure meanscomprising: a first inverted generally U-shaped closure memberincluding: a first pair of legs of plastic material having rigid innerportions respectively engageable with said casing left and right sidewalls and integrally formed flexible outer gasket portions respectivelyengageable with said opening side walls, and a first plastic panelsecured to and joining said legs and having a flexible bottom edgeengageable with said casing top wall; and a second inverted generallyU-shaped closure member including: a second pair of legs of plasticmaterial including rigid portions mounted in track means provided by therigid inner portions on said first pair of legs for slidable telescopicmovement relative to said first pair of legs and having flexibleintegrally formed gasket portions respectively engageable with saidopening side walls; and a second plastic panel bridging said second pairof legs in overlapping relationship to said first panel and a flexibleupper member connecting said legs for engagement with said opening topwall; said first and second pairs of legs being extruded from generallysimilar compound materials, one of which forms the flexible gasketportions and is softer than the compound material forming the rigidinner portions of said legs.
 2. The invention of claim 1, wherein saidsecond closure member comprises a second panel mounted in second trackmeans provided in the rigid portions of said second pair of legs forslidable movement relative to the first panel of said second closuremeans, said second panel overlapping the panels in both of said closuremembers.
 3. The invention of claim 2, further including gasket means forproviding a fluid seal between the outer peripheries of said panels andsurfaces adjacent thereto.